Physics Electromagnetic Induction DUHS 2022
PMDC Verified Question 53 of 69
For efficient transfer of electricity through cables over the long distance:
A
Both the current and voltage must be low
B
The current must be low and voltage high
C
Both the current and voltage must be high
D
The voltage must be zero and current low
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: The current must be low and voltage high
Concept:

Power loss in transmission lines is governed by Joule heating (\( P_{\text{loss}} = I^2 R \)).

Solution:

  • To deliver a required amount of power (\( P = VI \)), we can alter the balance of \( V \) and \( I \).


  • Because heat loss is proportional to the square of the current (\( I^2 \)), grid operators use step-up transformers to dramatically increase voltage.


  • This forces the current to be low and voltage high, ensuring maximum efficiency over hundreds of kilometers.


Why other options are incorrect:

High current causes massive resistive heating lines. Low voltage would require high current to deliver identical power, defeating the purpose.

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